Internal-combustion engine.



J. W. MITCHELL.

INTERNAL COMBUSTION ENGINE. APPLICATION FILED 1AN.23.1915.

1 169 5560 Patented Jan. 25, 1916.

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7 JOHN W. MITCHELL, ELLSWORTH, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO JAMES V. MITCHELL, OF ELLSWOBTH, PENNSYLVANIA.

INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent. Patented Jan, 25, 1916,

Application filed January 23, 1915. Serial No. 3,995.

To all whom'it may concern:

Be it known that 1, JOHN W. MITCHELL, a citizen of the United States, residing at Ellsworth, in the county of Washington and State of Pennsylvania, have invented certain new and useful Improvements in Internal-Combustion Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to internal combustion engines, and more particularly to those driven by means of an inflammable mixture of vaporized gasolene or oil and air; and it consists in the novel construction and com bination" of the parts hereinafter fully described and claimed.

In the drawings, Figure 1 is a vertical section through an engine constructed according to this invention. Fig. 2 is a side view of the engine looking at one end of its crankshaft.

Any suitable supporting frame 2-is provided, and 3 is the crankshaft which is journaled in bearings 4 on the frame, and provided with a crank 5. The power cylinder 6 is secured to the frame, and is kept cool in any approved way, and is provided with a piston 7. A connecting-rod 8 is pivoted to the piston, and operates to revolve the crank 5 in the usual manner.

At the rear end of the cylinder, which is the other end from the crankshaft, a combustion chamber or space 10 is provided which is frusto conical in form, and at the smaller end of this chamber an exhaust valve 12 is arranged. This valve is preferably a lift valve provided with a central stem 14, and having a spring 15 which normally holds the valve on its seat.

A cam 16 is provided on the crankshaft, and this cam operates a rod 17 periodically, and opens the exhaust valve 12 by means of a trip lever 18. The trip lever 18 is pivoted to a bracket 19 on the cylinder. One end of this lever is pivoted to the upper end of the rod 17 by a pin 20, and its other end is operatively connected with the stem of the exhaust valve.

The drawings show the piston at the front end of its stroke, and the exhaust valve open.

The cylinder has an inlet port 21 at its front end portion which is uncovered by the 29 of any approved construction so that the inlet valve may he regulated to open and cut off earlier or later, as required.

The inlet pipe 30 is connected to the inlet chamber 25, and a .blower or fan 31 is connected to the inlet pipe. The eye or intake of the blower is connected to a carbureter 32 of any approved construction by a pipe 33, and this pipe 33 has also an air valve 34 on one side of it so that the composition of the inflammable charge may be varied. The

carburetor has a supply pipe 35 for gasolene or oil, and an air supply pipe 36.

The blower or fan 31 is of any approved construction, and it is driven from the crankshaft by any approved driving mechanism, such as a driving belt 38 which passes over a pulley 39 on the blower shaft and over a pulley 40 on the crankshaft. The blower is revolved continuously, and the inlet pipe 30 and the inlet chamber 25 form a reservoir for the inflammable mixture. WVhen a prearranged low pressure is attained in this reservoir, the blower runs idly, so that the pressure in the reservoir never becomes excessive. When the exhaust valve is opened the products of combustion expand through it, and the inlet port is opened so that the front end portion of the cylinder, next to the piston, is filledwith inflammable mixture. As the piston moves rearwardly most of the products of combustion are forced through the exhaust valve, which is then closed, and the inflammable mixture is compressed in the combustion chamber during the latter part of the rearward stroke of the piston. The compressed inflammable mixture is ignited, by any suitable igniter 42, when the piston commences its forward stroke.

A series of engines, such as hereinbefore described, is preferably arranged with the cylinders side by side, and the crankshaft has its cranks arranged at suitable angles so I that the cylinders may exert power one after another in regular order.

The valve 34 is not ordinarily required to be opened, and all the air and hydrocarbon are ordinarily drawn through the carbureter by the fan blower, and are intimately mixed together by its arms or vanes. The inflammable mixture is forced by the fan blower into the inlet pipe 30, or into the inlet manifold when several cylinders are used. The

inlet pipe forms a reservoir in which the mixture is held under a substantially constant pressure, and from which the cylinder inder, a piston reciprocating in the cylinder,

the cylinder being provided with an inlet port overrun by the piston at the end of the working stroke, and a valve controlled exhaust at the other-end of the cylinder, a valve casing communicating with the inlet port, a slide valve in the valve casing controlling the-cylinder inlet port, means foroperating the valves from the crank-shaft, and a fan blower discharging into the valve casing.

2. In an" internal combustion engine, a cylinder, a piston reciprocating in. the cylinder, a crank shaft, the cylinder being provided with an inlet port overrun by the pistonat the end of the working stroke, and a valve controlled exhaust port at the other end of the cylinder, a valve casing communicating with the inlet port, a hollow piston valve slidable in the valve casing open to the top 'of the casing and closed at the bottom -and provided with a port adapted to register with the cylinder inlet port, a fan blower discharging into the upper end of the valve casing, a carbureter connected to the fan blower, and means for operating the valves from the crank shaft.

In testimony whereof I have aflixed my I signature in the presence of two witnesses.

JOHN IV. MITCHELL.

WVitnesses N. F. RICHARDSON, HOMER T. GAUT. 

